Objective:To compare the efficacy of a neuroleptic (haloperidol) to a monoamine oxidase inhibitor antidepressant (phenelzine sulfate) against the affective, cognitive, and impulsive-aggressive symptoms of criteria-defined borderline inpatients in an effort to dissect apart affective and schizotypal symptom patterns or subtypes using medication response.

Design:Randomized, double-blind, placebo-controlled trial.

Setting:Inpatient unit of a tertiary care university psychiatric hospital serving a large public catchment area.

Results:Three-way comparisons between groups indicated superior efficacy for phenelzine, followed by placebo and haloperidol on measures of depression, borderline psychopathologic symptoms, and anxiety. Pairwise comparisons between medication and placebo revealed significant efficacy for phenelzine against anger and hostility but no efficacy against atypical depression or hysteroid dysphoria. We were unable to replicate prior reports of efficacy for the neuroleptic.

Conclusions:Pharmacologic dissection of borderline personality disorder patients into affective and schizotypal subtypes could not be demonstrated.